CT Quiz (1/2)

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employee training

nuclear medicine

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Joshua Liberty

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CT Quiz (1/2)

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CT Quiz (1/2)Version en ligne Slides 1-14 PP par Joshua Liberty 1 CT scan serves two purposes in Nuclear medicine. They are? a Attenuation correction b Anatomical mapping c Lesion detection d All of these e Attenuation correction and anatomical mapping f Anatomical mapping and lesion detection 2 Who discovered X-rays? a Marie Curie b Wilhelm Roentgen c William Baqurel d Pierre Curie 3 Modern X-ray tubes are evacuated glass tubes with a window for produced X-rays to leave the tube. a True b False 4 Inside vacuum tubes, e- are boiled off an electrically heated filament wire, called the ? a Anode b Cathode c Electron stream filament d Tungsten target 5 These e- are accelerated to high velocity toward the ? a Anode b Cathode c Positively charged tungsten target d Anode and positively charged tungsten target e All of these 6 What causes the e- to be accelerated to high velocity? a High potential difference sustained between the filament and the target b Low potential difference between the filament and the target c High potential difference between the glass envelope and the focusing cup d Low potential difference between the tungsten target and the focusing cup 7 Most of these e- interact with outer shell e- of the tungsten target and their kinetic energy is lost as ? a Compton scatter b Gamma rays c Electrical discharge d Heat 8 About 2% of the e- that interact with outer shell e-of tungsten target cause the release of an X-ray by? a Characteristic or Bremsstrahlung radiation b Characteristic radiation c Bremsstrahlung radiation d None of these 9 Characteristic X-rays produce variable energies from 0 KeV to a max defined by the maximum voltage or peak voltage applied between the filament and the target. a True b False 10 Bremsstrahlung interactions are discrete. a True b False 11 Larger peak applied voltage is expressed as? a Milliamps b mA c kVp d keV 12 The greater the maximum X-ray energy, and the higher the number of x-rays created. a True b False 13 The lower the energy x-rays in the x-ray beam increase rad dose to the patient but do not increase image quality. a True b False 14 In order to stop a increased rad dose to the patient from lower energy x-rays what should be applied? a Software filter b Hardware filter c Increase voltage d Decrease voltage 15 What 2 purposes do filter have on CT? a Allow for increased sensitivty b Consistent or homogeneous energy distribution across CT detectors c Decrease noise d Stops low energy x-rays e Consistent or homogeneous energy distribution across CT detectors and stops low energy x-rays 16 By removing low energy x-rays the beam is? a Hardened b Scattered c Reduced randoms d Allowing for lower temperature 17 Beam hardening results in ? a Increased rad exposure b Consistent average energy c Reduced amount of electricity needed d 18 Higher kVp advantages? a Higher rad dose to patient b Decreased ability to differentiate tissue density c Greater X-ray penetration; less noise; less beam hardening d All of these e None of these 19 Higher kVp disadvantages? a Higher rad dose to patient b Decreased ability to differentiate tissue density c Greater X-ray penetration; less noise; less beam hardening d All of these e None of these f Higher rad dose to patient, and Decreased ability to differentiate tissue density 20 Artifacts radiate from bone where lower energies were attenuated but higher pass through. a True b False 21 The amount of electricity is expressed in? a milliamps b microamps c millivolts d microvolts 22 What affects the number of total x-rays produced? a The amount of electricity b Time c The amount of electricity and time d The number of x-ray generators 23 The byproduct of producing x-rays is? a Gamma rays b Noise c Heat d Dead time 24 Heat is removed from the tungsten target by? a Copper backing b Gold backing c Rapid spinning of target d Casual spinning of target e Copper backing and Rapid spinning of target f Gold backing and Rapid spinning of target 25 Higher mA advantages? a Increased rad dose to patient b Less noise, better tissue contrast c Less noise d Better tissue contrast 26 Higher mA disadvantages? a Increased rad dose to patient b Less noise, better tissue contrast c Less noise d Better tissue contrast 27 Images created using x-rays are used to image the body, the images we see are inverse shadows. a True b False 28 Denser tissues such as bone appear dark on a X-ray. a True b False 29 Soft tissues such as lungs appear as dark spots on x-rays. a True b False 30 Like NM, x-ray using motionless x-ray source and detector is called? a Planar imaging b Dynamic imaging c SPECT imaging d None of these 31 If X-ray data is acquired over 360 degrees around the patient, the data can be reconstructed using? a Attenuation correction b Back projection c Filtered back projection d Cine player 32 There are 2 methods of CT, which uses a nonmoving ring of detectors? a Rotate-Rotate system b Stationary-Planar c Rotate-Stationary system d Rotate-Point and shoot system 33 There are 2 methods of CT, which uses a moving ring of detectors and the x-ray source moves? a Rotate-Rotate system b Stationary-Planar c Rotate-Stationary system d Rotate-Point and shoot system 34 As the x-ray source moves around the patient , at each position the tube is turned on and the patient receives _____ of x-rays. a Cone b Circle c Fan beam d slice 35 What creates the fan beam shape? a Post-patient collimator b Prepatient collimator c Shape of the x-ray tube d Material of the target 36 Why is the Post-patient collimator is used? a Decrease scatter and set slice thickness b Decrease noise c Increase sensivity d Decrease rad dose to patient 37 Post-patient collimators set slice thickness except in? a Gated CT b SPECT c Multi-slice CT d Limited scans, such as hands and feet 38 Slice thickness is is between ____ to _____ a 0.1mm to 10nm b 0.2mm to 20nm c 0.3mm to several nm d 0.4mm to 40nm 39 Slice thickness has no determination on whether a lesion can be seen? a True b False 40 Adaptive Array detector is used in? a CT b Multi-slice CT c X-ray d MRI 41 Adaptive array detectors allow varying mm detectors to be turned on or off to set slice thickness. a True b False 42 There can be individual detectors that can be grouped or combined to create varying slice thickness. a True b False 43 Advantages of Thinner collimation. Which of these is not correct? a Less volume averaging b Better resolution on sagittals and coronals c Increased spatial resolution d Fewer streaking artifact from high density objects e None of these 44 Disadvantage of Thinner collimation. Which of these is true? a Increased noise due to less photons per slice (quantum mottle) b Increased scan time (thinner slices = more slices needed per area of body) c Results in more slices based on reconstruction slice thickness setting chosen d All of these Feedback 9 They are discrete(unchangeable energy). 10 They produce variable energies from 0 KeV to a max defined by the maximum voltage or peak voltage applied between the filament and the target. 28 They appear white 39 it sets the frames to determine whether a lesion can be seen.

CT Quiz (1/2)Version en ligne

Slides 1-14 PP

par Joshua Liberty

CT scan serves two purposes in Nuclear medicine. They are?

Attenuation correction

Anatomical mapping

Lesion detection

All of these

Attenuation correction and anatomical mapping

Anatomical mapping and lesion detection

Who discovered X-rays?

Marie Curie

Wilhelm Roentgen

William Baqurel

Pierre Curie

Modern X-ray tubes are evacuated glass tubes with a window for produced X-rays to leave the tube.

True

False

Inside vacuum tubes, e- are boiled off an electrically heated filament wire, called the ?

Anode

Cathode

Electron stream filament

Tungsten target

These e- are accelerated to high velocity toward the ?

Anode

Cathode

Positively charged tungsten target

Anode and positively charged tungsten target

All of these

What causes the e- to be accelerated to high velocity?

High potential difference sustained between the filament and the target

Low potential difference between the filament and the target

High potential difference between the glass envelope and the focusing cup

Low potential difference between the tungsten target and the focusing cup

Most of these e- interact with outer shell e- of the tungsten target and their kinetic energy is lost as ?

Compton scatter

Gamma rays

Electrical discharge

Heat

About 2% of the e- that interact with outer shell e-of tungsten target cause the release of an X-ray by?

Characteristic or Bremsstrahlung radiation

Characteristic radiation

Bremsstrahlung radiation

None of these

Characteristic X-rays produce variable energies from 0 KeV to a max defined by the maximum voltage or peak voltage applied between the filament and the target.

True

False

Bremsstrahlung interactions are discrete.

True

False

Larger peak applied voltage is expressed as?

Milliamps

kVp

keV

The greater the maximum X-ray energy, and the higher the number of x-rays created.

True

False

The lower the energy x-rays in the x-ray beam increase rad dose to the patient but do not increase image quality.

True

False

In order to stop a increased rad dose to the patient from lower energy x-rays what should be applied?

Software filter

Hardware filter

Increase voltage

Decrease voltage

What 2 purposes do filter have on CT?

Allow for increased sensitivty

Consistent or homogeneous energy distribution across CT detectors

Decrease noise

Stops low energy x-rays

Consistent or homogeneous energy distribution across CT detectors and stops low energy x-rays

By removing low energy x-rays the beam is?

Hardened

Scattered

Reduced randoms

Allowing for lower temperature

Beam hardening results in ?

Increased rad exposure

Consistent average energy

Reduced amount of electricity needed

Higher kVp advantages?

Higher rad dose to patient

Decreased ability to differentiate tissue density

Greater X-ray penetration; less noise; less beam hardening

All of these

None of these

Higher kVp disadvantages?

Higher rad dose to patient

Decreased ability to differentiate tissue density

Greater X-ray penetration; less noise; less beam hardening

All of these

None of these

Higher rad dose to patient, and Decreased ability to differentiate tissue density

Artifacts radiate from bone where lower energies were attenuated but higher pass through.

True

False

The amount of electricity is expressed in?

milliamps

microamps

millivolts

microvolts

What affects the number of total x-rays produced?

The amount of electricity

Time

The amount of electricity and time

The number of x-ray generators

The byproduct of producing x-rays is?

Gamma rays

Noise

Heat

Dead time

Heat is removed from the tungsten target by?

Copper backing

Gold backing

Rapid spinning of target

Casual spinning of target

Copper backing and Rapid spinning of target

Gold backing and Rapid spinning of target

Higher mA advantages?

Increased rad dose to patient

Less noise, better tissue contrast

Less noise

Better tissue contrast

Higher mA disadvantages?

Increased rad dose to patient

Less noise, better tissue contrast

Less noise

Better tissue contrast

Images created using x-rays are used to image the body, the images we see are inverse shadows.

True

False

Denser tissues such as bone appear dark on a X-ray.

True

False

Soft tissues such as lungs appear as dark spots on x-rays.

True

False

Like NM, x-ray using motionless x-ray source and detector is called?

Planar imaging

Dynamic imaging

SPECT imaging

None of these

If X-ray data is acquired over 360 degrees around the patient, the data can be reconstructed using?

Attenuation correction

Back projection

Filtered back projection

Cine player

There are 2 methods of CT, which uses a nonmoving ring of detectors?

Rotate-Rotate system

Stationary-Planar

Rotate-Stationary system

Rotate-Point and shoot system

There are 2 methods of CT, which uses a moving ring of detectors and the x-ray source moves?

Rotate-Rotate system

Stationary-Planar

Rotate-Stationary system

Rotate-Point and shoot system

As the x-ray source moves around the patient , at each position the tube is turned on and the patient receives _____ of x-rays.

Cone

Circle

Fan beam

slice

What creates the fan beam shape?

Post-patient collimator

Prepatient collimator

Shape of the x-ray tube

Material of the target

Why is the Post-patient collimator is used?

Decrease scatter and set slice thickness

Decrease noise

Increase sensivity

Decrease rad dose to patient

Post-patient collimators set slice thickness except in?

Gated CT

SPECT

Multi-slice CT

Limited scans, such as hands and feet

Slice thickness is is between to _

0.1mm to 10nm

0.2mm to 20nm

0.3mm to several nm

0.4mm to 40nm

Slice thickness has no determination on whether a lesion can be seen?

True

False

Adaptive Array detector is used in?

Multi-slice CT

X-ray

MRI

Adaptive array detectors allow varying mm detectors to be turned on or off to set slice thickness.

True

False

There can be individual detectors that can be grouped or combined to create varying slice thickness.

True

False

Advantages of Thinner collimation. Which of these is not correct?

Less volume averaging

Better resolution on sagittals and coronals

Increased spatial resolution

Fewer streaking artifact from high density objects

None of these

Disadvantage of Thinner collimation. Which of these is true?

Increased noise due to less photons per slice (quantum mottle)

Increased scan time (thinner slices = more slices needed per area of body)

Results in more slices based on reconstruction slice thickness setting chosen

All of these

Feedback

They are discrete(unchangeable energy).

They produce variable energies from 0 KeV to a max defined by the maximum voltage or peak voltage applied between the filament and the target.

They appear white

it sets the frames to determine whether a lesion can be seen.

CT Quiz (1/2)

Test

Téléchargez la version pour jouer sur papier

Créé par

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